[shikamaru]

I want to know something very basic about sliding mesh.

As shown in the picture, if I have a solid zone with sliding mesh on top of a fluid zone, what will be the momentum boundary condition in the interface?
Will it be a No Slip wall? or it will have no effect on the flow? in that case what is boundary condition for momentum in the fluid side of the interface? ( Given that I declared the interface between two zones as a coupled wall while creating the interface.)

[vasava]

There is no need to declare momentum boundary condition for the interface. Fluent will take care of it.

[shikamaru]

Originally Posted by vasava

There is no need to declare momentum boundary condition for the interface. Fluent will take care of it.

My knowledge so far on this:

The momentum boundary will be a zero velocity wall on each time step. So, basically the movement of the top part will have no effect on the fluid flow and will act just as an stationary wall when the interfaced is declared as a "Coupled wall". However, you will have a new wall and wall-shadow in your boundary which you can apply moving wall boundary condition.

If I had temperature that will pass through as heat flux which fluent will calculate using "virtual polygon approach" (which only appears in all the available fluent manuals one time only without any reference what so ever)